SACRAMENTO, Calif. — California Gov. Gavin Newsom vetoed a landmark bill aimed at establishing first-in-the-nation safety measures for large artificial intelligence models Sunday.
The decision is a major blow to efforts attempting to rein in the homegrown industry that is rapidly evolving with little oversight. The bill would have established some of the first regulations on large-scale AI models in the nation and paved the way for AI safety regulations across the country, supporters said.

Earlier this month, the Democratic governor told an audience at Dreamforce, an annual conference …